在尝试创建opencv

Question

我理解这是一个ffmpeg错误，但我认为ffmpeg已被弃用。我该怎么办？我是make的新手。

root@e0b310d499eb:~/opencv-2.4.9/Release# sudo apt-get install ffmpeg                                                      
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package ffmpeg is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'ffmpeg' has no installation candidate

我试图直接从git安装ffmpeg，但它没有帮助。 有什么建议吗？